Vietnam war: Nov 1, 1955 – Apr 30, 1975
explanation: After the fall of the Japanese Empire, the Indochinese country of Vietnam refused to be retaken by the French. France thus sent in an army to counter this opposition but instead ended up fighting a communist Vietnamese force known as Viet Minh. France fought the Viet Minh for about seven years but ultimately lost the war in August 1954. After the French soldiers departed, Vietnam was left divided between two political parties - a largely communist population in the north, and a Catholic anti-communist population in the south.
..... sorry if that's a lot I searched it up and put it in my own words